British Airways Boeing 747-436 G-BYGC operating BA49 London Heathrow – Seattle was close to Northampton when it stopped the climb at approximately 10,000 ft due to pressurisation issues. The aircraft circled close to Northampton to troubleshoot then headed to the Essex Coast off Clacton to dump fuel before returning to London Heathrow. The flight was operated later by sister G-BYGG. G-BYGC re-entered service later in the evening operating BA247 London Heathrow – Sao Paulo.